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dashboards_screenshot

Capture a PNG screenshot of any Lovelace dashboard view in Home Assistant. Configure viewport size, zoom, and wait time for dynamic content.

Instructions

Capture a PNG screenshot of a Lovelace dashboard view via the Puppet engine.

Requires the Puppet add-on (balloob's repo):

  1. In HA: Settings → Add-ons → Add-on Store → ⋮ → Repositories Add: https://github.com/balloob/home-assistant-addons

  2. Install 'Puppet', set its 'access_token' option to a long-lived HA token, start it.

On Docker/standalone: set NEXUS_SCREENSHOT_ENGINE_URL=http://:10000

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
url_pathNoLovelace path, e.g. 'caly-dom' or 'lovelace/0'. Omit for default.
widthNoViewport width in pixels (default 1280).
heightNoViewport height in pixels (default 800).
wait_msNoSettle time in ms after load — increase for heavy chart cards (default 2500).
full_pageNoCapture full scrollable page instead of just the viewport.
zoomNoZoom factor (default 1.0).

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must carry the full behavioral burden. It fails to disclose potential side effects, failure modes (e.g., if Puppet is not running), or response format details beyond the schema. Only states it captures a screenshot via Puppet.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences for the main function plus a bullet-style installation guide. Front-loaded with purpose. The installation steps are essential but make it slightly longer. Overall efficient with minimal fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers the essential setup (add-on installation, token configuration) but lacks information about output format (despite output schema existing), error handling, or prerequisites like where to generate the long-lived token. Could be more complete for a tool with external dependencies.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. The description adds minor extra guidance for wait_ms ('Settle time... increase for heavy chart cards'), but otherwise relies on schema. Does not significantly enhance parameter understanding beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states 'Capture a PNG screenshot of a Lovelace dashboard view via the Puppet engine.' The verb 'capture' and resource 'screenshot of a dashboard view' are specific. No sibling tool performs screenshots, so it stands out.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides detailed installation prerequisites for the Puppet add-on, which is necessary for usage. However, no explicit guidance on when to use this tool vs alternatives (e.g., other dashboard tools), leaving usage context implied.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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